mongo-cxx-driver r4.6.1

C++ Driver for MongoDB

Release notes

## Fixed

- Reject embedded NUL characters in `distinct` fields. CVE-2026-106430

## Changed

- Bump the minimum required C Driver version to [2.5.6](https://github.com/mongodb/mongo-c-driver/releases/tag/2.5.6).

See the [full list of changes in Jira](https://jira.mongodb.org/issues/?jql=project%20%3D%20CXX%20AND%20fixVersion%20%3D%204.6.1).

## Feedback
To report a bug or request a feature, please open a ticket in the MongoDB issue management tool Jira:

- [Create an account](https://jira.mongodb.org) and login.
- Navigate to the [CXX project](https://jira.mongodb.org/browse/CXX)
- Click `Create`.

## Signature Verification
Release artifacts may be verified by using the accompanying detached signature (.asc) and the cpp-driver public key obtained from https://pgp.mongodb.com.

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